Marsh — North American Species of Cyclops. 1099 



than pools. It is one of the common species in the limnetic 

 regions of the Great Lakes. 



CYCLOPS PHALERATUS Koch. 



Plate LXXIX, fig. 9; plate LXXX, figs 1-6. 



1838. Cyclops phaleratus Koch, H 21, pi. IX. 



1851. " canthocarpoides Fischer, p. 426, pi. X, figs. 24, 25, 32-38. 



1853. " " Lilljeborg, p. 208. 



1857. " " Claus, p. 37, pi. I, figs. 6-10. 



1863. " • " Claus, p. 102, pi. IV, figs. 1-4. 



1863. " " Lubbock, p. 202. 



1863. " phaleratus Sars, p. 255. 



1872. " canthocarpoides Fric, p. 223, fig. 19. 



1874. " lascivus Poggenpol, p. 72, pi. XV, figs. 22-24, pi. XVI, figs. 

 7 and 8. 



1874. " Fischeri Poggenpol, p. 73, pi. XV, fig. 28, pi. XVI, figs. 



12-15. 



1875. " phaleratus Uljanin, p. 38, pi. IX, figs. 1-5. 

 1878. " " Brady, p. 116, pi. XXIII, figs. 7-13. 



1882. " adolescens Herrick, p. 231, pi. VI, figs. 15-20. 



1883. " perarmatus Cragin, p. 7, pi. I, figs. 9-18. 



1884. " phaleratus Herrick, p. 161, pi. R, figs. 6-10. 



1885. " " Daday, p. 252. 



1887 " " Herrick, p. 14, pi. VII, figs. 2, a-d. 



1888. " " Sostaric, p. 74, pi. II, figs. 21-22. 



1890. " " Lande, p. 75, pi. XX, figs. 126-136. 



1891. " " Brady, p. 25, pi. IX, fig. 2. 

 1891. " " Richard, p. 238, pi. VI, fig. 12. 



1891. " " Schmeil, p. 36. 



1892. " " Lande, p. 171. 



1892. " " Schmeil, p. 170, pi, VIII, figs. 1-11. 



1893. " " Marsh, p. 216, pi. VI, figs. 6 and 7. 



1895. " " Herrick, and Turner, p. 120, pi. XVII, figs. 1-7, 



pi. XVIII, figs. 2-2d, pi. XIX, fig. 1, pi. XXI, 

 figs. 6-10. 



1895. 

 1897. 

 1901. 

 1903. 

 1909. 



Marsh, p. 19. 



Forbes, p. 59, pi. XX, fig. 3. 



Lilljeborg, p. 105, pi. VI. figs. 20-21. 



Graeter, p. 499. 



Byrnes, p. 31, pi. XV, figs. 1-9. 



The cephalothorax (PL LXXX, fig. 1) is elliptical; its 



breadth is two thirds of its length. The first segment comprises 

 nearly one-half of its length. The fifth segment is armed pos- 

 teriorly with a row of spines. 



